LED CONTROLLER. AL3353 Datasheet

AL3353 CONTROLLER. Datasheet pdf. Equivalent


Diodes AL3353
AL3353
HIGH PERFORMANCE BOOST LED CONTROLLER
Description
The AL3353 is a highly-integrated and cost-effective Light Emitting
Diode (LED) controller optimized for LCD monitor and LCD TV
backlighting application. It provides a high-performance LED backlight
solution with low-BOM cost.
The AL3353 contains a PWM boost driver, which uses current mode
control and fixed frequency operation to regulate the LED current.
The LED current is sensed through an external current sense resistor.
The voltage across the sensing resistor is compared with reference
level of 400mV; the error is amplified to control the pulse width of the
power switch thus to regulate the current flowing the LED.
Pin Assignments
(Top View)
VIN 1
GATE 2
GND 3
CS 4
8 PWM
7 OVP
6 COMP
5 FB
The AL3353 offers PWM-to-analog dimming mode for a wide range of
dimming control.
SO-8 (Type TH2)
The AL3353 has comprehensive protection features such as power
MOSFET overcurrent protection (OCP), output overvoltage protection
(OVP), Diode & Inductor short protection, LED cathode short-to-GND
protection, IC power supply undervoltage lockout (UVLO), LED open
protection, VOUT short protection and overtemperature protection
(OTP).
The AL3353 is available in the SO-8 (Type TH2) package.
Features
Wide Input Voltage Range: 9V to 40V
High Precision Feedback Reference Voltage: 400mV/±1.5%
Current Mode PWM Controller with Good Dynamic Response
PWM to Analog Dimming Mode
Built-In Comprehensive Protections
Under Voltage Lock Out (UVLO)
Output Over Voltage Protection (OVP)
Power MOSFET Over Current Protection (OCP)
Diode and Inductor Short Protection
LED Cathode Short to GND Protection
LED Open Protection
VOUT Short Protection
Over Temperature Protection (OTP)
Available in Pb-Free SO-8 (Type TH2) Package
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Applications
LCD TV
LCD Monitor
Flat Panel Display
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant.
2. See https://www.diodes.com/quality/lead-free/ for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and
Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
AL3353
Document number: DS41487 Rev. 2 - 2
1 of 15
www.diodes.com
February 2019
© Diodes Incorporated


AL3353 Datasheet
Recommendation AL3353 Datasheet
Part AL3353
Description HIGH PERFORMANCE BOOST LED CONTROLLER
Feature AL3353; NEW PRODUCT AL3353 HIGH PERFORMANCE BOOST LED CONTROLLER Description The AL3353 is a highly-integr.
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Datasheet
Download AL3353 Datasheet




Diodes AL3353
Typical Applications Circuit
VIN
EN
PWM
GND
F1
D1
R1
C1
L1
VIN PWM
GATE OVP
GND
CMP
CS FB
C2
R2
D2
C3
R4
Q1
R3
R5
R6
Figure 1. Typical Application Schematic
Pin Descriptions
Pin Number
1
2
3
4
5
6
7
8
Pin Name
VIN
GATE
GND
CS
FB
COMP
OVP
PWM
Function
Power Supply Input
Gate Drive Output
Ground
Current Sense Input
LED Current Feedback
Boost Converter Loop Compensation
Overvoltage Protection Sense
PWM Signal Input for Analog Dimming Control
AL3353
AL3353
Document number: DS41487 Rev. 2 - 2
2 of 15
www.diodes.com
February 2019
© Diodes Incorporated



Diodes AL3353
Functional Block Diagram
AL3353
PWM
8
6
COMP
5
FB
4
CS
OSC
PWM
Control
EA
Current
Sense
Thermal
Shutdown
L
Σ
PWM
Comparator
OVP
Protection
UVLO
Control
Logic
1
VIN
Gate
Drive
2
GATE
3
GND
7
OVP
Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified. Note 4)
Symbol
Parameter
Rating
Unit
VIN, VGATE, VOVP
VCS, VFB, VCOMP, VPWM
TJ
TSTG
TLEAD
θJA
θJC
VIN, GATE, OVP Pin Voltage
CS, FB, COMP, PWM Pin Voltage
Operating Junction Temperature
Storage Temperature Range
Lead Temperature (Soldering, 10sec)
Thermal Resistance (Junction to Ambient) (Note 5)
Thermal Resistance (Junction to Case) (Note 5)
-0.3 to 43
-0.3 to 7
+150
-65 to +150
+260
+105
6.6
V
V
°C
°C
°C
°C/W
°C/W
– ESD (Charge Device Model)
750 V
– ESD (Human Body Model)
2000
V
Notes:
4. Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only and
functional operation of the device at these or any other conditions beyond those indicated under “Recommended Operating Conditions” is not implied.
Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability.
5. Device mounted on 1"x1" FR-4 substrate PCB, 2oz copper, with minimum recommended pad layout.
Recommended Operating Conditions
Symbol
VIN
fPWM
TA
Parameter
VIN Pin Voltage
PWM Frequency for Analog Dimming
Ambient Temperature
Min
Max
Unit
9 40 V
5 50 kHz
-40
+105
°C
AL3353
Document number: DS41487 Rev. 2 - 2
3 of 15
www.diodes.com
February 2019
© Diodes Incorporated







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